Observe: Look at the Front view on the SIMULATION pane. In which direction is the current moving through the wire? (Note: The current direction shown is the direction of positive charge. In reality, electrons move in the opposite direction through the wire.) Predict: Scientists use the right-hand rule to predict the direction of an induced magnetic field-or a magnetic field created by a current. To use the right-hand rule, position your right hand so that the thumb points in the direction of the current. The magnetic field lines wrap around the wire in the same direction as the fingers of your right hand. If the current was pointed down, will the induced magnetic field be clockwise or counterclockwise? Test Set the Current to -60 amps. In which direction is the current now moving through the wire What is the direction of the induced magnetic field? On your own: Use a battery, wire, and small compass to demonstrate magnetic induction. Describe your results in your science journal or notebook. Activity B: Get the Gizmo ready: Remove all the compasses from the table. Magnetic field Turn on Show grid and Show interactions magnetic field sensor Set the Current to 0 Amps. Question: How does Earth's magnetic field interact with an induced magnetic field? Experiment: You can use the probe to measure the strength of the magnetic field (represented by the symbol B) at various locations on the grid. The unit for magnetic field strength is the gauss (G) Move the probe to different places on the grid. What is the strength of the magnetic field? Why is there a magnetic field even when there is no current? Observe: Set the Current to 50 amps. Place the probe at point (50, 0). What is the strength of the field? To find the strength of the induced magnetic field alone, subtract the strength of Earth's magnetic field from value you measured in part A What is the strength of the induced magnetic field alone? Compare: Now, move the probe to (-50, 0). What is the total strength of the field? How does this compare to the strength of the field at point (50, 0)